Choosing the Right Power-Efficient Xeon CPU for a Dedicated Unraid Server Build

[Socrates]

I've been using Unraid for the past eight years, running it on an ESXi VM. Now, I'm looking to build a dedicated hardware server using server-grade parts. I already have an LGA 2011-based Supermicro motherboard in a 24-bay 4U Supermicro chassis, along with 128GB of RAM. However, I'm unsure about which CPU to choose.

My plan is to use a lower TDP dual CPU setup. I won't be running many VMs—maybe 2 to 4, including one for a Plex server that will handle a single stream (mainly for my use when traveling). Given these requirements, is it better to go for a CPU with more cores or a higher base frequency for an Unraid server? I'm not interested in AMD or newer-generation CPU components, as I already have most of the parts. I just need to pick up a used server-grade Xeon E5-26xxV4 CPU from eBay, ideally one that's power-efficient with a TDP under 90W. Any advice on the best CPU for this setup would be greatly appreciated.